/Engine/Plugins/Experimental/MeshModelingToolsetExp/Source/MeshModelingToolsExp/Public/MeshVertexSculptTool.h
bool IsHitTriangleBackFacing ( int32 TriangleID, const [FDynamicMesh3](API\Runtime\GeometryCore\DynamicMesh\FDynamicMesh3) * QueryMesh )